2,4,5-TP (Silvex)
Natchitoches Water System
2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.
22
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 3 ppb
The EWG Health Guideline of 3 ppb for 2,4,5-TP was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.
EPA Maximum Contaminant
Level (MCL) 50 ppb
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-14 | AD90602 | ND |
| 2014-04-14 | AD90602 | ND |
| 2015-03-09 | 35178883003 | ND |
| 2015-03-09 | 35178883003 | ND |
| 2015-10-12 | 35211703003 | ND |
| 2015-10-12 | 35211703003 | ND |
| 2016-04-12 | 35239164010 | ND |
| 2016-04-12 | 35239164010 | ND |
| 2016-11-21 | 35279123004 | ND |
| 2016-11-21 | 35279123004 | ND |
| 2017-04-10 | 35306447004 | ND |
| 2017-04-10 | 35306447004 | ND |
| 2017-10-23 | 35344156001 | ND |
| 2017-10-23 | 35344156001 | ND |
| 2018-01-22 | 35370029001 | ND |
| 2018-01-22 | 35370029001 | ND |
| 2018-07-31 | 35408508001 | ND |
| 2018-07-31 | 35408508001 | ND |
| 2019-02-25 | 35450970001 | ND |
| 2019-02-25 | 35450970001 | ND |
| 2019-08-07 | 35488971001 | ND |
| 2019-08-07 | 35488971001 | ND |